package Filter;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

@WebFilter(filterName = "loginFilter")
public class loginFilter implements Filter {
    String[] ignores;

    public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, IOException {
        HttpServletRequest request=(HttpServletRequest) req;
        HttpServletResponse response=(HttpServletResponse) resp;
        HttpSession session=request.getSession();
        String uri=request.getRequestURI();
        if (session.getAttribute("username")!=null|| isIgnore(uri)){
            chain.doFilter(request, response);
        }else{
            response.sendRedirect("login.jsp");
        }
    }
    private boolean isIgnore(String uri){
        for (String str:ignores){
            if (uri.indexOf(str)!=-1){
                return true;
            }
        }
        return false;
    }

    public void init(FilterConfig config) throws ServletException {
String ignore =config.getInitParameter("ignore");
ignores=ignore.split(",");
    }

}
